The Chinese River Dolphin, or Baiji (Lipotes vexillifer) is a freshwater dolphin found only in the Yangtze River in China. It is the only member of its genus. Other names for it include Beiji, Pai C'hi, Whitefin Dolphin, Whiteflag Dolphin, Yangtze Dolphin, and Yangtze River Dolphin.

Its population has been estimated at just five animals, and it is therefore thought to be the world's most endangeredcetacean.